promoter database

I'm now trying to search for the target sequence of a transcription factor.
I'd like to have a serching tool to satisfy following two points.
1) tissue
I want to search by the name of tissue where both my transcription factor
and putative
target genes are expressed.
2) sequence
In addition to #1, if possible, I want to search by target sequence.
Because the target
seqence of my factor is each 4-base-pair-long recognition sequence,
separated by 6-base-pair
spacer, the tool is expected to permit "N".
I'd like to have these tools for EPD (eucaryotic promoter database) which
lacks seaching tools.
If any database and tools exist, let me know about it, please.
*****************************************************************************************
Takuya MURATA t-murata at bs.aist-nara.ac.jp
NAIST Dept. of bioscience,Lab of Molecular Development
*****************************************************************************************